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From wuchong <...@git.apache.org>
Subject [GitHub] flink pull request #3039: [FLINK-5280] Update TableSource to support nested ...
Date Sat, 24 Dec 2016 15:32:05 GMT
Github user wuchong commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3039#discussion_r93818167
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/sources/TableSource.scala
---
    @@ -19,21 +19,32 @@
     package org.apache.flink.table.sources
     
     import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.table.api.TableEnvironment
     
    -/** Defines an external table by providing schema information, i.e., field names and
types.
    +/** Defines an external table by providing schema information and used to produce a
    +  * [[org.apache.flink.api.scala.DataSet]] or [[org.apache.flink.streaming.api.scala.DataStream]].
    +  * Schema information consists of a data type, field names, and corresponding indices
of
    +  * these names in the data type.
    +  *
    +  * To define a TableSource one need to implement [[TableSource#getReturnType]]. In this
case
    +  * field names and field indices are derived from the returned type.
    +  *
    +  * In case if custom field names are required one need to implement both
    +  * [[TableSource#getFieldsNames]] and [[TableSource#getFieldsIndices]].
       *
       * @tparam T The return type of the [[TableSource]].
       */
     trait TableSource[T] {
     
    -  /** Returns the number of fields of the table. */
    -  def getNumberOfFields: Int
    -
       /** Returns the names of the table fields. */
    -  def getFieldsNames: Array[String]
    -
    -  /** Returns the types of the table fields. */
    -  def getFieldTypes: Array[TypeInformation[_]]
    +  def getFieldsNames: Array[String] = {
    +    TableEnvironment.getFieldNames(getReturnType)
    +  }
    +
    +  /** Returns the indices of the table fields. */
    +  def getFieldsIndexes: Array[Int] = {
    --- End diff --
    
    The plural of index should be indices.



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